John c



EXTENSION,GHLW'DELIER. H No. 295,020. 7 Patented-.11 11,1884.

N. PETERS. Plmn-lilhowa flwr. Washington. D. c.

' mes rates Farnnr rrrcao THE'MERIDEN MALLEABLE IRON COMPANY,

OF SAME PLACE.

EXTENSlON-CHANDELIER.

SPECIFICATION forming part of LettersPatent No. 295,020, dated March 11, 188

I I Application filed November 26, 1883. (No model.)

To all whom it may concern: I

Be it known that I, JOHN G. KNIGHT, of Meriden, in the county of New Haven and State of Connecticut, have invented a new Improvement in Extension-Chandeliers; and I do hereby declare the following, when taken in connection with accompanying drawings and the letters of reference marked thereon, to bea full, clear, and exact description of the same, andwhich said drawings constitute part of this specification, and represent, in

Figure 1, a sectional side view of so much of the fixture as will illustrate my invention; Fig. 2, a vertical section of the locking mechanism enlarged; Fig. 3, a top or plan view of the locking device; Fig. 4, a side view of the ring-shaped spring detached; Fig. 5, a modification.

This invention relates to an improvement in that class of lamp-chandeliers which are made adjustable as to elevation, and in which a telescopic rod is employed, one portion being secured to the ceiling and the lamps to the other portion, so that the movable portion may be drawn down or raised,as occasion may require. This class of fixtures is provided with a lifting device to counterbalance the weight of the movable part of the fixture, and as the weight of the movable part is variable, because of different weights of lamps or shades which may be applied, or because of the fount containing more or less oil, it is necessary that there shall be some securing device to hold the movable part at any position to which it may be adjusted. 7

It is to the securing device that my invention particularly relates;v and it consists in the construction as hereinafter described, and more particularly recited in the claims.

A represents the inner rod or tube, and B the outer tube, to which the chandelier-arms are attached in the usual manner. The part A is fixed or secured to the ceiling. Through this tube A a cord or chain, 0, extends downward from the lifting device above, and into connection with the movable part B, as at a. This lifting device above is common and well known, and does not require description in this specification; or, instead of applying the lifting device above, it may be by the fingers.

a helical spring extending down throug tube A and into the tube B, its uppei secured to the tube A, and the lower or the movable part below, as at a, and so drawing down the movable part will ex the spring. Then the reaction of the S will aid in lifting the movable part, the p of the spring being supposed to substant counterbalance the movable part of th ture. The lifting device, however, is no of my invention.

At or near the upper end of the tube an annular chamber or recess, D. In recess a divided elastic ring, E, is arra: around the inner tube, so asto rest on the tom of the chamber D. Opposite the divi of the ring a projection, b, extends radi; and at the divided ends there is a projecl respectively (1 6. These projections ex onto the bottom of the chamber, so as to i a bearing or support for the ring. This is of somewhat less diameter than the i1 tube, and so as to closely embrace it and l firmly thereon. Between the two projec ends (I c of the divided ring, which are a l. distant from each other, a cam, f, is 111 from which an arm, h, extends, and is pre ably turned around to the side, as seen ml 3. From the end of this arm h a cord, ch or wire, 1", extends downward between outer and the inner tubesay, to a transvr bar, F, in the lower end of the ohandel This bar extends outward to the right and through a slot, and so as to be easily reac A person then applying fingers to the bar F and pulling downw will draw down the arm h of the lever: correspondingly turn the cam f between ends (I e of the ring, as seen in broken lii and such turning of the cam will open the vided end of the ring, causing the ring to pand and release its grasp upon the inner tl or rod, and when the ring is thus held movable part may be raised or lowered, the case may be. The elasticity of the r itself serves to return the cam and arm k W] the pull from below is released and to regr: the inner rod or tube. The cam is best hr in its position by making a notch, Z, in 1 projecting end e narrower than the cam,

r Figs. 3 and 4, and then making the a thickness corresponding to the width iotch, and so as to lie therein, as shown. otch forms a fulcrum, over which the d its arm work as a lever. The elastic 'asps the rod so firmly that it will resist ;ing power of the spring or whatever ing device is, that power being always nt to hold the movable part up against g wherever it maybe on the fixed tube B; and while usually a smooth inner of the ring and a correspondingly 1 surface of the fixed tube will be suffi- 3116 fixed tube may be annularly ribbed, l in Fig. 5, and the inner surface of the ring correspondingly grooved, as seen same figure, the ribs of one interlocking he ribs of the other; or the correspondrfaces of the spring and the inner tube may be made otherwise irregular. This action makes the gripping or looking .nism independent of the lifting power, y overcoming difficulties in those preconstructions which require that there )e a lifting movement to force an engagebetween the stationary and movable I We represented the connection from the i which operates the cam, as being down gh the tube to a cross-bar, F, below; [is connection maybe to any of the usual as for operating the clamping mechanism ension-fixtures.

some cases it is desirable that the clamp- :vice shall aid in supporting the movatrt of the fixture. To do this the chamis provided with a cover, G, against 1 the upper end of the ring will bear as s upon the bottom of the chamber. This in and top of the chamber are to be unaod as shoulders in the outer tube, against 1 the ring-shaped spring may bear. This art for the movable part of the fixture is able in case of the giving way of the lift evice; or, as in some cases, the chandenay be a greater weight than the counter- [CO can support, and therefore, if left the movable part would fall. By makhe shoulder above, therefore, the ringed spring grasping the inner tube serves support for the movable part of the fixindependent of the lifting device.

In very light fixtures this locking device may be employed without any lifting or counterbalancing mechanism. In that case to adjust the fixture the person pulls downwardsay, the bar Fto open the grasp of the ring, then moves the fixture up or down, as the case may be, and when arrived at the desired position releases his hold and the grasp is made upon the inner tube, so as to secure the movable part in that position.

I claim- 1. The combination of the stationary inner tube or red, A, the outer tube carrying the lamps, and constructed with a recess or shoulder, D, the divided ring-shaped spring E, surrounding the inner tube, and constructed to take a bearing upon the bottom of the shoulder or recess D, and so as to closely embrace the inner tube, the cam f between the divided ends of the spring, the said cam provided with an arm, 71, extending therefrom, and a connection from the arm downward, whereby said cam may be turned to relieve its grasp upon the inner tube, substantially as described.

2. The combination of the inner tube or rod, A, the outer tube, B, carrying the lamps, the divided ring-shaped spring E, arranged in a recess in the outer tube, and so as to embrace the inner rod or tube and take a bearing upon the bottom or top of said recess, as the case may be, a cam, 1, between the ends of said divided ring-shaped spring, said cam provided with an arm, h, and connection therefrom downward, whereby said cam may be turned to release the grasp of said spring upon the inner rod, substantially as described.

3. The combination of the inner stationary tube or red, A, the outer movable rod, 13, con structed with an internal recess, D, the divided ring-shaped spring E, arranged in said recess, and constructed to grasp the inner rod, one of the ends of the divided spring constructed with a notch, Z, the cam f, with its arm 71, arranged in said notch Z as a fulcrum,

the cam standing between the divided ends of the ring-shaped spring, and a connection from the arm downward, whereby said cam may be turned, substantially as described.

.TOHX C. KNIGHT. \Vitnesses:

Gno. \V. Snrrn,

Err I. IWERRDI AX. 

